Fault estimation for LPV system with LFT parameter dependence

The robust H-infinity fault estimation problem for a class of Linear Parameter Varying (LPV) systems which can be formulated in an LFT framework has been studied in this paper. Based on small gain techniques, a new method for the design of a robust gain scheduled H-infinity fault estimator is developed, the resulting estimator achieves high performance by incorporating the available measurements of the time-varying parameters, and therefore adjusts to the current plant dynamics. The existence of such gain-scheduled H-infinity fault estimator is characterized in terms of linear matrix inequalities. The underlying synthesis problem is a convex program for which efficient optimization techniques are available. To demonstrate the proposed method, a numerical example is considered. Simulation results show that the designed LPV fault estimator is effective for a class of LPV plants.